Hoisting equipment and hoisting device

Abstract

The invention relates to the technical field of unmanned aerial vehicle hoisting, in particular to hoisting equipment and a hoisting device.The hoisting equipment comprises an unmanned aerial vehicle body, a power system arranged in the unmanned aerial vehicle body and a hoisting system arranged at the bottom of the unmanned aerial vehicle body; and the supporting legs can be matched to fix an article when the article is hoisted. The hoisting device comprises a damping platform and a hoisting assembly, the damping platform comprises a buffer spring fixed to an unmanned aerial vehicle body and a connecting plate fixed to the end of the buffer spring, supporting legs are installed at the bottom of the connecting plate, and the hoisting assembly is integrally fixed to the connecting plate. When the lifting hook pulls goods upwards, the supporting feet provide supporting force for the goods, the supporting force is balanced with the pulling force of the lifting hook, and the goods can be fixed to the bottom of the unmanned aerial vehicle. The problem that an existing large-load unmanned aerial vehicle cannot conveniently change the carrying mode according to the use environment is solved, the transportation mode can be flexibly changed according to different cargoes, and the good transportation effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicle (UAV) hoisting, and in particular to a lifting device and a hoisting apparatus. Background Art

[0002] A large-load UAV is an unmanned aerial vehicle with a strong carrying capacity. It usually adopts a rotor design and has the ability to take off and land vertically. It can take off and land without a runway or a fixed take-off and landing site. In addition, they usually have remote control or autonomous flight capabilities and can complete various tasks under the guidance of a pilot or a preset route. The load capacity of large-load UAVs can usually reach hundreds to thousands of kilograms, or even more, which allows them to effectively transport materials over long distances and solve the problems in traditional logistics. At the same time, they have broad application prospects in the fields of national defense construction, emergency rescue, agricultural plant protection, etc.

[0003] The existing UAV transportation loading methods mainly include fuselage pod and external pod. The fuselage pod is to fix the cargo or equipment on the lower part of the UAV fuselage, and to suspend the load and transport it through the sling connection. The main working principle of the fuselage pod is to connect the aircraft and cargo through the sling, suspend the cargo on the hanger under the cabin, and adjust the center of gravity to match the UAV to maintain flight stability. The external pod is to fix the cargo or equipment on the outside of the UAV fuselage. Because the hoisting method can more flexibly adjust the length and angle of the sling to adapt to cargo of different weights and shapes, if the items to be transported are heavy, large, or irregular in shape, the fuselage pod method is more suitable. For smaller, lighter or regular-shaped items, they can be directly fixed to the bottom of the UAV for transportation. In long-distance or complex terrain transportation (such as mountainous areas, forests, etc.), the fuselage pod method can fly directly from the starting point to the end point, avoiding road congestion and transfer links, and improving transportation efficiency. If the transportation distance is short and the terrain is flat, it is more convenient and quick to hang the items on the bottom of the UAV.

[0004] When faced with different usage environments and different transported goods, existing drones cannot flexibly change the way they carry goods. Drones with external pods usually do not have a structure for hanging cargo, and drones with fuselage pods are usually not convenient for fixing cargo directly on the fuselage. Therefore, it is difficult for the same drone to adapt to different usage scenarios to achieve better transportation effects.

[0005] Therefore, a lifting device and a hoisting device are proposed. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In view of the problem that the existing large-load UAV is not convenient to change the loading mode according to the use environment to achieve a better transportation effect, the present invention is proposed.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A lifting device includes a drone body, a power system arranged inside the drone body, and a hoisting system arranged at the bottom of the drone body, wherein the drone body is provided with a support foot at the bottom, and the support foot can be used to fix the object when hoisting the object. When the hook pulls the object upward, the top of the object contacts the support foot, and the support foot gives the object a downward force, which is balanced with the pulling force of the hook, so that the object can be fixed to the bottom of the drone.

[0010] As a preferred embodiment of the lifting equipment of the present invention, the support leg is installed on the lifting system, including a connecting section and a functional section. The connecting section is rotatably connected to the bottom of the UAV fuselage through the support leg shaft, a slide is provided inside the connecting section, a support spring is installed in the slide, one end of the functional section extends into the slide, one end of the support spring is connected to the slide, and the other end is connected to the functional section. The end of the functional section away from the slide is a spherical foot pad, the outer side of the spherical foot pad is tangent to the functional section, and the inner side protrudes from the functional section. The support leg is "L" shaped as a whole.

[0011] Therefore, when transporting a flatter disc-shaped heavy object, the legs can be opened like claws first, the disc-shaped heavy object can be placed horizontally between the legs, and then the legs can be retracted, and the heavy object can be clamped at the "L"-shaped inflection point to ensure that the heavy object will not be affected by the airflow and shake, causing the drone to fly unsteadily, thereby causing a safety accident.

[0012] As a preferred solution of the lifting equipment of the present invention, a positioning groove is provided on one side of the connecting section, a positioning piece is slidably installed in the positioning groove, a positioning hole is provided at one end of the functional section located inside the connecting section, and the positioning piece passes through the positioning groove and is threadedly connected to the positioning hole.

[0013] Thus, the length of the legs can be adjusted according to the shape and volume of the heavy object to be fixed, so as to adapt to the variable goods to be transported.

[0014] A lifting device, suitable for the lifting equipment as described above, includes a shock-absorbing platform and a lifting assembly, the shock-absorbing platform includes a buffer spring fixed to the drone fuselage and a connecting plate fixed to the end of the buffer spring, the support foot is installed at the bottom of the connecting plate, and the lifting assembly is fixed to the connecting plate as a whole.

[0015] The shock-absorbing platform can balance the interaction force between the cargo and the drone during flight, reduce the swaying of the cargo, and reduce the impact of the swaying of the cargo on the flight of the drone.

[0016] As a preferred solution of the hoisting device of the present invention, the hoisting assembly includes a winch, a hook assembly and a limit assembly. The winch is installed in a shock-absorbing platform and is controlled by a power system. A hook rope is wound on its surface. The hook rope is made of low-elasticity cast steel material. When subjected to external force, the deformation is relatively small, and the force can be transmitted more accurately, reducing the deviation caused by the elastic deformation of the material, better resisting impact and vibration, maintaining the stability of the hoisting, and reducing the risk of accidents. A through hole is provided on the connecting plate. The through hole can be opened as large as possible while ensuring the strength of the connecting plate to avoid friction with the hook rope. The hook rope passes through the through hole, and its end is connected to the hook assembly.

[0017] When using the fuselage pod mode for transportation, turn the winch to extend the hook cable, and the lowest position of the hook assembly is below the bottom of the support leg, so that the support leg does not touch the cargo, and the cargo can be hung. When using the fuselage external hanging mode, tighten the hook cable upwards to make the top of the cargo touch the support leg, or make the cargo completely within the range of the support leg, and the bottom touches the support leg, so as to fix the cargo.

[0018] As a preferred embodiment of the lifting device of the present invention, the hook assembly includes a hook body, a hook body and a reset spring, a through cavity is opened in the hook body, a rotating shaft is arranged in the through cavity, a baffle is vertically arranged at the lower end of the hook body, the hook body is rotatably installed in the hook body through the rotating shaft and passes through the through cavity, including a straight end and a bent end, the bent end can abut against the baffle, the straight end is connected to the reset spring, and the other end of the reset spring is connected to the hook body and is located below the rotating shaft.

[0019] Therefore, when the goods are transported by hanging, the hook body deflects under the action of the goods' own weight, and the end contacts the baffle to form a closed loop, ensuring that the goods will not be unhooked. When the goods are transported to the designated location, the goods fall to the ground, and the hook body lacks the pull of weight and deflects under the action of the return spring, thereby achieving automatic unhooking of the goods and facilitating the unloading of the goods.

[0020] As a preferred solution of the lifting device of the present invention, the limiting assembly includes a sliding cavity, a sliding ring, a locking hook and a positioning block opened at the bottom of the shock-absorbing platform. The sliding ring is slidably installed inside the sliding cavity, and a groove is opened at the bottom thereof. The locking hook is rotatably installed around the sliding ring at equal distances, one end of which is elastically connected to the side wall of the sliding ring, and the other end can fit tightly with the support leg shaft. The positioning block is installed above the hook assembly and can engage with the groove.

[0021] As a preferred solution of the lifting device of the present invention, wherein: torsion springs are sleeved on both ends of the support leg shaft, and the torsion springs are located on both sides of the lock hook and connected to the connecting section, so that the support leg can maintain stable support even when there is no external force. When subjected to external force, the torsion spring provides the support leg with force on the cargo.

[0022] As a preferred solution of the lifting device of the present invention, the sliding ring includes a free position and a locked position in the sliding cavity, a slot is provided on the upper side wall of the sliding cavity, a ball slot is provided on the inner circumference of the sliding ring, an ejection spring and a ball are provided in the ball slot, one end of the ejection spring is connected to the inner wall of the ball slot and the other end is connected to the ball, when the sliding ring is in the locked position, the ball can engage with the slot, a counterweight plate is provided at the bottom of the sliding ring, and when there is no external force, the sliding ring slides down to the free position under the action of the counterweight plate.

[0023] When the positioning block is not in contact with the sliding ring, the sliding ring is in a free position, at which point the sliding ring pulls one end of the lock hook downward and the other end tilts upward, so that the lock hook does not contact the support leg and does not lock the support leg. When the hook rope is pulled upward so that the positioning block is in the groove and engages with the groove, the sliding ring is pulled up to the top, and the ball rolls further into the slot to fix the sliding ring. At this point, the sliding ring pulls one end of the lock hook connected to it upward, causing the other end of the lock hook to deflect downward and contact the support leg shaft, so that the support leg is fixed and cannot deflect further.

[0024] As a preferred solution of the lifting device of the present invention, wherein: the support leg shaft is coated with friction material, and the contact position between the locking hook and the support leg shaft is correspondingly coated with friction material to enhance the friction between the two, so that the locking hook can effectively fix the rotating shaft, and the fixing of the rotating shaft by the locking hook is not a hard limit, thereby avoiding damage to the two caused by collision and the like.

[0025] Beneficial effects of the present invention:

[0026] 1. Through the cooperation of the support legs and the hook assembly, the drone can freely realize two ways of transporting goods: hoisting goods or hanging goods. When the hook is in a lower position, the support legs do not participate in the fixation of the goods. At this time, the goods are only hoisted by the hook rope. When the hook is pulled to the highest point, the support legs interact with the goods and balance the force provided by the hook, so as to fix the goods.

[0027] 2. Through the setting of the hook assembly, the goods can be automatically unhooked when the hoisted goods arrive at the designated delivery location, which is convenient for unloading of goods, speeds up the unloading time and saves human resources.

[0028] 3. Through the limit assembly, the fixation of the support foot is linked to the position of the hook. When the hook is at the highest point (that is, when the hook rope is fully retracted), the support foot is fixed. If no goods are transported, the support foot can support the drone body. If goods need to be transported, the fixed support foot can also provide stable support for the goods. When the hook position is lower than the support foot, the support foot is not fixed. When the hook pulls the goods upward, it can adjust and fit according to the shape of the top of the goods. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0030] Figure 1 It is a schematic diagram of the overall structure of the lifting equipment of the present invention.

[0031] Figure 2 It is a cross-sectional view of the support leg structure of the present invention.

[0032] Figure 3 This is a schematic diagram of the structure of the shock-absorbing platform and lifting components under the lifting equipment.

[0033] Figure 4 It is a cross-sectional view of the hook of the present invention.

[0034] Figure 5 for Figure 3 Cross-sectional view at point A.

[0035] Figure 6 for Figure 5 Enlarged view of point B (the sliding ring is in the free position).

[0036] Figure 7 for Figure 6 Enlarged view of point C.

[0037] Figure 8 It is a schematic diagram of the structure when the sliding ring is in the locking position.

[0038] In the figure: 1. UAV fuselage; 11. Support foot; 111. Connecting section; 112. Functional section; 113. Support foot shaft; 113a. Torsion spring; 114. Slide; 115. Support spring; 116. Spherical foot pad; 117. Positioning groove; 118. Positioning piece; 119. Positioning hole; 2. Power system; 3. Lifting system; 4. Shock-absorbing platform; 41. Buffer spring; 42. Connecting plate; 421. Through hole; 5. Lifting assembly; 51. Winch; 511. Hook cable; 52. Hook assembly Parts; 521, hook body; 521a, through cavity; 521b, rotating shaft; 521c, baffle; 522, hook body; 522a, straight end; 522b, bent end; 523, return spring; 53, limit assembly; 531, sliding cavity; 531a, slot; 532, sliding ring; 532a, groove; 532b, ball groove; 532c, ejection spring; 532d, ball; 533, lock hook; 534, positioning block; 355, counterweight; Z, free position; S, locked position. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0042] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0043] See also Figure 1 to Figure 2 The present invention provides a lifting device, and the technical solution is as follows:

[0044] Reference Figure 1A lifting device includes a drone body 1, a power system 2 arranged inside the drone body 1, and a lifting system 3 arranged at the bottom of the drone body 1, characterized in that a support foot 11 is arranged at the bottom of the drone body 1, and the support foot 11 can be used to fix the object when lifting the object.

[0045] Reference Figure 2 The support leg 11 is installed on the lifting system 3, and includes a connecting section 111 and a functional section 112. The connecting section 111 is rotatably connected to the bottom of the drone body 1 through a support leg shaft 113. A slideway 114 is provided inside the connecting section 111, and a support spring 115 is installed in the slideway 114. One end of the functional section 112 extends into the slideway 114. One end of the support spring 115 is connected to the slideway 114, and the other end is connected to the functional section 112. The end of the functional section 112 away from the slideway 114 is a spherical foot pad 116. The outer side of the spherical foot pad 116 is tangent to the functional section 112, and the inner side protrudes from the functional section 112. The support leg 11 is "L"-shaped as a whole.

[0046] Reference Figure 2 A positioning groove 117 is provided on one side of the connecting section 111, and a positioning member 118 is slidably installed in the positioning groove 117. A positioning hole 119 is provided on one end of the functional section 112 located inside the connecting section 111, and the positioning member 118 passes through the positioning groove 117 and is threadedly connected to the positioning hole 119.

[0047] When the cargo is transported in the form of a fuselage pod, the winch 51 is rotated to extend the hook 511, and the lowest position of the hook assembly 52 is located below the bottom of the support leg 11, so that the support leg 11 does not contact the cargo, and the cargo can be hung. When the cargo is transported in the form of a fuselage pod, the hook 511 is tightened upwards, so that the top of the cargo abuts against the support leg 11, or the cargo is completely within the range of the support leg 11, and the bottom abuts against the support leg 11, so that the cargo is fixed.

[0048] See also Figures 1 to 8 The present invention provides a lifting device, and the technical solution is as follows:

[0049] Reference Figure 1 and Figure 3 A lifting device includes a shock absorbing platform 4 and a lifting assembly 5. The shock absorbing platform 4 includes a buffer spring 41 fixed to the UAV fuselage 1 and a connecting plate 42 fixed to the end of the buffer spring 41. The support foot 11 is installed at the bottom of the connecting plate 42, and the lifting assembly 5 is fixed on the connecting plate 42 as a whole.

[0050] Reference Figure 3 and Figure 5The lifting assembly 5 includes a winch 51, a hook assembly 52 and a limit assembly 53. The winch 51 is installed in the shock-absorbing platform 4 and is controlled by the power system 2. A hook rope 511 is wound around its surface. The hook rope 511 is made of low-elasticity cast steel material. A through hole 421 is opened on the connecting plate 42. The hook rope 511 passes through the through hole 421, and its end is connected to the hook assembly 52.

[0051] Reference Figure 4 The hook assembly 52 includes a hook body 521, a hook body 522 and a return spring 523. A through cavity 521a is opened in the hook body 521, and a rotating shaft 521b is arranged in the through cavity 521a. A baffle 521c is vertically arranged at the lower end of the hook body 521. The hook body 522 is rotatably installed in the hook body 521 through the rotating shaft 521b and passes through the through cavity 521a. It includes a straight end 522a and a bent end 522b. The bent end 522b can abut against the baffle 521c. The straight end 522a is connected to the return spring 523. The other end of the return spring 523 is connected to the hook body 521 and is located below the rotating shaft 521b.

[0052] When the goods are transported by hanging, the hook body 522 deflects under the action of the weight of the goods, and the bent end 522b contacts the baffle 521c to form a closed loop, ensuring that the goods will not be unhooked. When the goods are transported to the designated location, the goods fall to the ground, and the hook body 522 lacks the pull of weight and deflects under the action of the reset spring 523, thereby achieving automatic unhooking of the goods and facilitating the unloading of the goods.

[0053] Reference Figure 5 The limiting assembly 53 includes a sliding cavity 531, a sliding ring 532, a locking hook 533 and a positioning block 534 opened at the bottom of the shock absorbing platform 4. The sliding ring 532 is slidably installed inside the sliding cavity 531, and a groove 532a is opened at the bottom thereof. The locking hook 533 is rotatably installed around the sliding ring 532 at an equal distance, one end of which is elastically connected to the side wall of the sliding ring 532, and the other end can be tightly fitted with the support foot shaft 113. The positioning block 534 is installed above the hook assembly 52 and can be engaged with the groove 532a.

[0054] Reference Figure 2 , Figure 6 and Figure 8 Torsion springs 113 a are sleeved on both ends of the support shaft 113 . The torsion springs 113 a are located on both sides of the locking hook 533 and are connected to the connecting section 111 .

[0055] Reference Figure 6-Figure 8The position of the sliding ring 532 in the sliding cavity 531 includes a free position Z and a locking position S. A slot 531a is provided on the upper side wall of the sliding cavity 531. A ball slot 532b is provided on the inner circumference of the sliding ring 532. An ejection spring 532c and a ball 532d are provided in the ball slot 532b. One end of the ejection spring 532c is connected to the inner wall of the ball slot 532b and the other end is connected to the ball 532d. When the sliding ring 532 is in the locking position S, the ball 532d can engage with the slot 531a. A counterweight plate 355 is provided at the bottom of the sliding ring 532. When there is no external force, the sliding ring 532 slides down to the free position Z under the action of the counterweight plate 355.

[0056] The support foot shaft 113 is coated with friction material, and the contact position between the locking hook 533 and the support foot shaft 113 is correspondingly coated with friction material.

[0057] When the positioning block 534 is not in contact with the sliding ring 532, the sliding ring 532 is in the free position Z. At this time, the sliding ring 532 pulls one end of the locking hook 533 downward and the other end tilts upward, so that the locking hook 533 does not contact the supporting leg 11 and does not lock the supporting leg 11. When the hook assembly 52 pulls the goods upward, the unfixed supporting leg 11 can be adjusted and fitted according to the shape of the top of the goods. When the hook rope 511 is pulled upward and the positioning block 534 is located in the groove 532a and engaged with the groove 532a, the sliding ring 532 is pulled up to the top, and the ball 532d further rolls into the slot 531a to fix the sliding ring 532. At this time, the sliding ring 532 pulls one end of the locking hook 533 connected to it upward, so that the other end of the locking hook 533 deflects downward and contacts the support leg shaft 113, so that the support leg 11 is fixed and cannot continue to deflect. At this time, the fixed support leg 11 is completely in contact with the top of the cargo and can provide stable support for the cargo. Through the action of the hook assembly 52 and multiple support legs 11 on the cargo, the cargo can be stably fixed to the bottom of the drone fuselage 1.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lifting device, comprising an unmanned aerial vehicle body (1), a power system (2) arranged inside the unmanned aerial vehicle body (1), and a lifting system (3) arranged at the bottom of the unmanned aerial vehicle body (1), characterized in that: The bottom of the drone body (1) is provided with a support foot (11), and the support foot (11) can be used to fix objects when hoisting them.

2. The lifting device according to claim 1, characterized in that: The support foot (11) is installed on the lifting system (3), and comprises a connecting section (111) and a functional section (112). The connecting section (111) is rotatably connected to the bottom of the drone body (1) via a support foot shaft (113). A slideway (114) is provided inside the connecting section. A support spring (115) is installed inside the slideway (114). One end of the functional section (112) extends into the slideway (114). One end of the support spring (115) is connected to the slideway (114), and the other end is connected to the functional section (112). The end of the functional section (112) away from the slideway (114) is a spherical foot pad (116). The outer side of the spherical foot pad (116) is tangent to the functional section (112), and the inner side protrudes from the functional section (112). The support foot (11) is in an "L" shape as a whole.

3. The lifting device according to claim 2, characterized in that: A positioning groove (117) is provided on one side of the connecting section (111), a positioning piece (118) is slidably installed in the positioning groove (117), a positioning hole (119) is provided on one end of the functional section (112) located inside the connecting section (111), and the positioning piece (118) passes through the positioning groove (117) and is threadedly connected to the positioning hole (119).

4. A lifting device, suitable for the lifting equipment as described in claims 1 to 3, characterized in that: The invention comprises a shock absorbing platform (4) and a lifting assembly (5), wherein the shock absorbing platform (4) comprises a buffer spring (41) fixed to a drone body (1) and a connecting plate (42) fixed to the end of the buffer spring (41), the supporting foot (11) is mounted on the bottom of the connecting plate (42), and the lifting assembly (5) is fixed on the connecting plate (42) as a whole.

5. The lifting device according to claim 4, characterized in that: The lifting assembly (5) comprises a winch (51), a hook assembly (52) and a limit assembly (53). The winch (51) is installed in the shock-absorbing platform (4) and is controlled by the power system (2). A hook rope (511) is wound around the surface of the winch. The hook rope (511) is made of low-elasticity cast steel. A through hole (421) is provided on the connecting plate (42). The hook rope (511) passes through the through hole (421) and an end thereof is connected to the hook assembly (52).

6. The hoisting device according to claim 5, characterized in that: The hook assembly (52) includes a hook body (521), a hook body (522) and a return spring (523). A through cavity (521a) is provided in the hook body (521), a rotating shaft (521b) is provided in the through cavity (521a), a baffle (521c) is vertically provided at the lower end of the hook body (521), the hook body (522) is rotatably installed in the hook body (521) through the rotating shaft (521b) and passes through the through cavity (521a), and includes a straight end (522a) and a bent end (522b), the bent end (522b) can abut against the baffle (521c), the straight end (522a) is connected to the return spring (523), and the other end of the return spring (523) is connected to the hook body (521) and is located below the rotating shaft (521b).

7. The hoisting device according to claim 6, characterized in that: The limiting assembly (53) comprises a sliding cavity (531) provided at the bottom of the shock absorbing platform (4), a sliding ring (532), a locking hook (533) and a positioning block (534); the sliding ring (532) is slidably installed inside the sliding cavity (531) and has a groove (532a) provided at the bottom; the locking hook (533) is rotatably installed around the sliding ring (532) at an equal distance, one end of the locking hook is elastically connected to the side wall of the sliding ring (532) and the other end can be tightly fitted with the support foot shaft (113); the positioning block (534) is installed above the hook assembly (52) and can be engaged with the groove (532a).

8. The hoisting device according to claim 7, characterized in that: Torsion springs (113a) are sleeved on both ends of the support shaft (113); the torsion springs (113a) are located on both sides of the locking hook (533) and are connected to the connecting section (111).

9. The lifting device according to claim 8, characterized in that: The position of the sliding ring (532) in the sliding cavity (531) includes a free position (Z) and a locking position (S); a slot (531a) is provided on the upper side wall of the sliding cavity (531); a ball slot (532b) is provided on the inner circumference of the sliding ring (532); an ejection spring (532c) and a ball (532d) are provided in the ball slot (532b); one end of the ejection spring (532c) is connected to the inner wall of the ball slot (532b) and the other end is connected to the ball (532d); when the sliding ring (532) is in the locking position (S), the ball (532d) can be engaged with the slot (531a); a counterweight plate (355) is provided at the bottom of the sliding ring (532); when no external force is applied, the sliding ring (532) slides down to the free position (Z) under the action of the counterweight plate (355).

10. The hoisting device according to claim 9, characterized in that: The support foot shaft (113) is coated with friction material, and the contact position between the locking hook (533) and the support foot shaft (113) is correspondingly coated with friction material.

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